A chamber pump (10) and a method for operating same are provided. The chamber pump (10) includes a pump chamber (12), a chamber diaphragm (14) or a piston (34) as well as an axially movable driving rod (24) acting on the chamber diaphragm (14) or on the piston (34) for changing the volume of the pump chamber (12). The chamber pump (10) includes an electroactive diaphragm (40, 40), which acts as an actuator for influencing an axial position of the driving rod (24) and acts on the driving rod (24), on the one hand, and on a housing of the pump (10), on the other hand. An electric potential is applied to the electroactive diaphragm (40, 40) during the operation of the chamber pump (10) to influence an axial position of the driving rod (24) and to achieve a return stroke or a forward stroke of the chamber pump (10).

A turbine vane for a rotary turbomachine has a turbine blade delimited by a concave pressure-side wall and a convex suction-side wall which are connected in the region of a vane front edge which can be assigned to the turbine blade and enclose a cavity which extends in the longitudinal extent of the vane front edge and is delimited on the inner wall by the pressure-side wall and the suction-side wall in the region of the vane front edge and by an intermediate wall which extends in the longitudinal direction to the vane front edge and connects the suction-side wall and the pressure-side wall on the inner wall. The intermediate wall has a perforation at least in sections in the connecting region to the suction-side wall and/or pressure-side wall, in order to increase the elasticity of the intermediate wall.

An eccentric screw pump with a rotor (2) and with a rotationally fixed stator (6; 6) surrounding the rotor (2). The rotationally fixed stator includes at least one elastomeric portion, wherein a pressure chamber (16) is arranged on this elastomeric portion of the stator (6; 6) at a side facing away from the rotor (2). The pressure chamber (16) is connected to a pressure region of the eccentric screw pump such that the at least one elastomeric portion of the stator (6; 6) is subjected to a pressure produced by the eccentric screw pump.

A coating solution that contains 10 to 20% by weight of epoxy resin serving as a thermosetting resin, 20 to 30% by weight of MoS.sub.2, and 5 to 10% by weight of graphite, with a remainder thereof constituted by an organic solvent, is sprayed onto a wrap portion side face of an orbiting scroll from a spray nozzle. While spraying the coating solution, the orbiting scroll is rotated on a rotating table and the spray nozzle is moved along a rectilinear movement path toward a radial direction outer side of the orbiting scroll while maintaining an attitude thereof from the start of the spraying process. After applying the coating solution, the coating solution is dried by baking, whereupon a break-in operation is performed. As a result, an elastic coating is formed at a coating thickness that enables elastic deformation in accordance with a clearance between the wrap portion side faces.

The present document describes a pump (10) comprising a casing (12) that encloses a pumping group (14). On the casing (12) at least one inlet conduit for inletting a fluid (F) and at least one outlet conduit for outletting the fluid (F) are obtained. The pumping group (14) comprises a pair of mutually coupled gears, each mounted on a respective support shaft. The relative movement of a first gear with respect to the second gear defines a pumping chamber having variable volume inside the pumping group (14), so as to suck the fluid (F) from the suction conduit to expel it through the delivery conduit. A first support shaft (16) is operatively connected to an actuator assembly (18) so that the first gear can operate as a driving gear to set the second gear in rotation. The pump (10) comprises at least one element (20) for compensating the increase in volume of the fluid (F) and/or the increase in the pressures inside such a pump (10). The element (20) for compensating the pressure/volume is at least partially manufactured from a shape memory metal alloy having superelastic properties.

A housing (10) of a compressor (1) according to the present embodiment includes at least one compression chamber (101) that compresses a gas aspirated into the inside thereof and is composed of a metal-resin composite (16) in which a resin member (14) composed of a thermosetting resin composition and a metal member (12) are bonded to each other. In a case where the metal-resin composite (16) is made into a test piece in which the resin member (14) having a thickness d.sub.1 and the metal member (12) having a thickness d.sub.2 are laminated on and bonded to each other and a ratio of d.sub.1/d.sub.2 is 3, and the test piece is put in a first state where the test piece is disposed, the surface on the resin member (14)-exposed side up, on two supports with no stress applied thereto and a second state where a 1-point bending stress of 140 MPa is applied in a thickness direction to the center of the surface on the resin member (14) side such that the center caves in after the first state, when putting in the first and second states is alternately repeated 1,000,000 times at a frequency of 30 Hz under a temperature condition of 25 C., the metal-resin composite exhibits bending fatigue resistance in which neither peeling nor fracture occurs.

A membrane system comprising a membrane and connecting elements for connecting the membrane to a membrane pump for conveying a fluid, which membrane pump has a drive shaft designed for an oscillating translatory movement perpendicular to the plane of the membrane during operation of the membrane pump and has an external thread at an end portion for engagement with the membrane system by screwing. To ensure a secure and torque-proof connection between the membrane and the connecting element to be screwed to a drive shaft, the connecting elements comprise a threaded socket, a thrust ring and a thrust plate.

An eccentric screw pump, with a stator body having a jacket and an elastic inner lining, with which the jacket is provided. According to a first aspect, the jacket and the inner lining are in each case formed with a thermoplastic plastic material. According to a second aspect, the jacket is formed with a thermoplastic plastic material, the inner lining is formed with a material with elastomeric properties and the stator body is produced in a two-component injection molding process or in an at least two-stage casting process. According to a third aspect, the jacket has a screw surface-like outer surface on the outer side at least in sections, which is modified area by area at least by means of additional demolding surfaces. According to a fourth aspect, a stator for an eccentric screw pump is further proposed, having an inner component or inner lining, which is provided for a cooperation with a rotor of the eccentric screw pump and which is formed with a thermoplastic elastomer or a thermoplastic polyurethane. An eccentric screw pump and a method for the production of a stator for an eccentric screw pump are further proposed.